Motor



Feb. 26, 1929.

G. H. GILMAN MOTOR Filed May 5. 1919 3 Sheets-Sheet Patented Feb. 26, 1929.

UNITED [STATE-s GEORGE H. GILMAN, v01? CLAREIOHT, VNEW HAMPSHIIR'ASSIGNQB-T0 SULLIVAN Pa'r'im'r OFFICE..

MACHINERY COMPANY, A GOB-PORATION Ol' CH'USIZITS.

MOTOR.

Appiicaumi sied nay 5, 1919. serial in. 295,014.

My invention relates to motors and more especially though not exclusively to pressure fluid motors foruse in mining, quarrying or the like.

vIt has for its object to provide an improved pressure fluid motor.r A further objecto my invention is to provide an improved, compact, light, and powerful construction adapted to increase',materially the cutting speed l of the tool, and at the saine time, etliciently lu- In the accompanying drawings I have shown for purposes ci illustration two embodiments which my invention may assun e in practice.

In these drawings,

Fig. 1 is a longitudinal, sectional view taken( on the line 1-1 of Fig. 3. of my improved motor, some of the parts being shown in side elevation.

Fig. Q- is a longitudinal, sectional view :3.0 thereof on the line Q--Q of Figs. 1 and F 3 is au cndvviewV of my improved motor. v

Fia'. 4 is a transverse, sectional view taken on line 1-4 of Figs. 1 and 2.

235 Fig. 5 is a longitudinal, sectional. detail view taken substantially on'tlie line 5-5 of Figs. 3 and 9.

Fie. 6 isa longitudinal sectionalview ot the cvlinder taken on line 6 6 of Fig. 3. Yi0 7 is another longitudinal sectional viewbot the cylinder taken on line 7-7 of Fia'. i i y Fig. 8 is a 'transverse sectional view taken on the line 8-8 ot Figs. l and Q.

i AFig'. f) :i transverse sectional view taken en the line 9-9 of Figs. 1 and 2.

F 10 is a transverse sectional view taken ou the line 10-10 of Figs. 1 and 2.

Fia'. 11 is a longitudinal sectional vieiv 30 Vtaken substantially on the line 114-11 of Fig.

3 showing-.the clutch lcontrolling mechanism.V

1Qv is a side elevation of a part of the mechanism. v .is transverse sectional view of the tool chuck taken `on the line 13-13 of Fig. 1. Fig. 141s another transverse sectional View of the tool chuck taken on the line 14--14'` of Fig. 1.

Fig. 15 is a longitudinal sectional view taken substantially on the line 11-.11 of Fig.

'3 showing the modified clutch controlling mechanism. Y

In this illustrative construction'7 it will be observed that I' have Vshown a motor cylinderV 1. which preferably has' a substantially elliptical shape throughout a part of its length as shown in Fig. 10 and which has a cylinder, or chamber 2, and a plurality ot' longitudinally extending side chambers 3 and 4.V The forward end of the cylinder is partially closed by a buffer ring 5 aga-inst which abuts a chuck housing 6.V rThis chuck housing encloses a chuck 7 and a locking ring8,

the chuck 7 being preferably mounted lto ro-r tate within the chuck housing 6. This chuck Ais adapted to receive a steel 9 havin lugs 10 formed thereon, the steel9 shown being preferably of the hollow type, having an'axia] bore 11 extending therethrough.

The opposite or'rear end of the cylinder is preferably partially closed by an end plate 12 carrying ahead block 13 on which is pret- Vce erably mounted a controlling valve 14 with i its controlling handle 14' for controlling the' flow of pressure fiuid from the vpipe linel 15 to the various parts of the motor. I preferably mounten the head block 13 a boss 16, to

be hereinafter more'fully described, having communication with a water tube 17 which l is shown as attached to the boss by a thread- Y ed nipple 18 and a nut 19, although any other of a number of'well known connections may A' be used if desired.

The parts of the tool so far described comprising the chuck 6 and theV head block 13- and the various members therebetween are `i preferably held rigidlytogether by a lurvalit)7 of side rods 2() and 21 which pre erably pass longitudinally through these tool elesleeve 26 being in my preferred-form carried by Vbushings or hollow dowelf'pins 2 7', 28m which the sleeve is attached byswagmgls is shown at 29. :These dowel serve the plurality of functions ofretaing the-sleeve 26in proper position, of closing. the ends of more fully described.

The motor comprising the; cylinder l and -the parts attached thereto is preferably mounted'so that it may be moved toward the work during the drilling operation or that 'it vmay be retracted to replace the steels, by a cradle in vwhich is rotathely mounted a feeding screw 3l operating in a nonrotative nut 32 preferably attached to the cylinder l,

a handle 33 being pro ided on the outer end of the feed screw 3l by means of which the .motor may be moved as desired. As the tool v is thus fed toward the worl, a. piston 34 mounted to reci recate in the cvlinder chain- Vber 2 under the influence of pressure fluid .admitted alternately to the opposite ends of -the cylinder is operated Vto drive a drill steel.

This piston is preferably spooledout near vthe center thereof to form an annular recess y 35 which cooperates with ports and passages hereinafter to be described-.,to regulate the `flow of fluid to the cylinder. On the forward Vend of the piston there is formed, in the preferred fform'of my invention, a. forwardly. vproJecting'striking head 36 adaptedv to pass througha recess 37 in the buffer ring 5 and clearly shown in llig.V4 4.

I sagesflfig. G) preferably communicate with 1 the. cylinder2 through a plurality vofpairs of inlet passages 47, 48, theinlet ports 47 being adaptedto communicate with therecess'VV '35 when the piston is adjacent the rear end being. preferably' closed. When the lpiste Contact with the shank end of the drill steel 9 to force the latteragainstthe work. vTo prevent thefcoinpressionof air in'this aperture 37, which compression may result in the forcing'v of the chuck into bindingV relation `.with the. cliuclrhousing, l preferably provide an Vannular recess 38 1n the buffer ring and Vent this recess to the atmosphere by a port l39, although as is obvious, other means may be used to prevent-the formation of a high pressure inthe buffer ring or the chuck liousfine'.

When itis desired to operate the pneumatic tool to drire a drill steel, the hollow .interior 40 of the Jorts 41` 42. with either or'both of two )a+ l l sageways 43, 44 to Aconduct pressure Vfluid from the pipe line l5 to a plurality of longitudinally disposed inlet passages 45, 46 asis These inlet pasof the cylinder and Vtheinlet port-s 48 being adapted tozconiinunicate .with this saine recess when. the piston is adjacent the forward end ofthelcylinder, the port-s 47' at this ti is adjacenttlie rear end of thecylindenas'is port GOisprovide-d controllingl valve 14 may Vbe placed in communication, by means of "space for the press re fluid, but l preiuabh.Y

fluid to thev rear end of the cylinder behind the piston through ports 53, 54. During the rearward movement of the piston, pressure fluid will be admitted first through the port 49, then the port 50, and finally the 'port 5l and will lenter the rear endl of the cylinder, through the small port 53 andan annular recess 53 communicating therewith to cushion the rearward movement of the piston, and also through the larger port 54. lf'it is desired, part of'these ports may be dispensed with, but inthe present invention, the port 49 is provided to prevent stopping of the piston in the center of the cylinder, and the port 50 is provided to permit on'earlier but smaller flow of fluid than does the port 5l so that this fluid flow may pass rapidly to the rear end of the cylinder to build up sufficient pressure toproperly cushion the piston on its rearward or return movement Without short stroking` or excessive shock. As thepiston inoves'forward, the ports 5l, 50, 49 are'successively cutoff in the order named, and pressure fluid is admit-ted fromthe 'inlet ports through ports ,48' aroundthe spooled section of the piston to a second pair of bypasses V preferably disposed in alignment with Vthe Vfirst bypasses but separated therefrom by webs 56. rllhe fluid flow is first through a small port 57- and as the piston moves further forward, through a larger port 58 to' these Vreturn bypasses, and from thence through ports'59 and 60 to the forward'end of the cylinder to drive the piston rearwardly. The port 57 is especially provided to Vpermit a small initial flow totheforward end of the cylinder through the port 8O and recess 60 vcommunieating therewith and with the cylinder to cushion the forward movement of the pistonshould the striking head not be stopped by a steel. flnjtlie preferredforin shown, a y in only one of the return bypasses, but as Vis obvious, lsimilar port may be'provided in theother bypasses. The

Vports 53 andGO, and Vgrooves 53"and 80 also piston in serve to preventthe sticking of the an endof the cylinder.-

lf desired. theends oit the cylinder or piston Y lli) may be hollowed out to provideexpansion use the hollow interior of the piston for a part of the steel rotating mechanism7 to be hereiny after described, andprovide expansion space outside of the cylinder space 2, but in coinniunication with this cylinder space, and also i withtlie bypasses.V lf1 or this purpose l pref v#ei-ablyV use the longitudinal passageway 4and divide this passageway into two 'expansion .chambers 6l, 62 by a web 63` which ispreferably' placed nearer. the forward end of the cylinder so' tliat'the expansion' chamber 6I communicating with' the rear end of the'cylin'cler 2 is larger than the expansion'chamber 62 communicatin-fr with the forward end of the cyly j commun icates with the corresponding bypass Lil) adjacent the front end of the cylinder, the latter not being shown since the construction 1s identical with that disclosed' in Fig. 5; Y It Vwill be noted tha'I have shown but one set o'f expansion chambers surrounding but one rod 2O and communicatingwith but oney pair of bypasses, but it will berobvious that if desired, a similar' set of expansion chambers may be formed adjacent the oth'er'side rod QI in communication with the other pair of bypasses. It Will further'be obvious that if it is desired, these expansion chambers may be formed else-where in the walls of the cylinder or on members formed on the cylinder insteadV of around a tie r'od as shown, but I preferably use this construction in order to lighten the mach-ine, to render it more' compact, reduce the number of pieces required', and reduce the cost of manufacture.

Alfter the pressure fluid-from' the expansion chambers and bypasses has been used to drive thepiston in one direction or the other, it may be exhausted to the atmosphere through suitable ports and for this purpose, a port 64 communicating withV an exhaust passage 65 is formed near the rear end of the Cylinder, and a port G6 is provided for exhaust-ing the pressure fiuid from the'front end of the cylinder, the exhaust from the latter end of the cylinder being directed forwardly away from the Upe'rator by a depending flange 67. In order to increase the efficiency of the motor, I preferably provide an exhaust valve for the rear end or the cj-,f'linder to permit the placing of the port (il near the center of the cylinder and so to delay the moment of exhaust as long us pos` sible and thereby permit a greater expansion ott-he fluid in this end of thecyliiuler wit-hout, however. causing short stro'liii'ig by excessive cushioning. As is obvious,a. similar exhaust valve may be provided to control'the exhaust jortadiaceut the front end .ofthe cylinder. .l Y

In the form of .my invention shown this exhaust valve is preferably carried in a boss 68 herein shown as formed integral with the cylinder l, a sleeve 69 being provided to close the open end oi a chamber formed in this boss in which chamber the stepped exhaust valve 7 O mounted. In theconstruction shown in the present drawings, the sleeve, valve, and boss are axially apertured to receive the nut 32 which rcoacts with the threaded rod 31 to feed the cylinder towardor away from the vWork, but this placing of the exhaust vulve is nota part ofthe presentV invention, the same being the invention Uf one VElmer Gv. Gartin valve' in the positionshown in and claimedby'hinin U. S; Patenti Nol-1,556,- 802 dated Gereser- 27, 1925. The valve 70 is preferably provided with' faces 'Tl'and 72 on which the pressure flhid acts to throw the' valve in one direction or the other to permit or check the exhausting' of Huid from the rear end of this` c li-nd'er', the ig. 1 bei-ng in its forward position to stopthe'ow of exhaust uid tothe atmosphere by the contact of the valve Witfl an annular seatl 73'- formed on the boss 68. The pressure fluid which acts on the annular surface 71 to force thev valve against the seat 73 is admitted from the rear end of the cylinder through a single or plu# rality of ports 74 and a passagev or passages 75 to an annular chamber 76, it being understood that the pressure admitted by these ports and passages to the face 71 is at its greatest when the recess 35 is in communication with the n bypass 52, is at its lowest when thepres'- der and therpistr isadjacent the ir'ofrrt end of the' cylinder with' the' exhaust port tfl'nneovered. The valve 7() is thrown in the opposite direction'when the piston moves far enough fornf'ard to permit pressure udfwm the recess 35 to enter a port 77, through alongitudinally disposed passageway 78,- and pass through a port 79 to'an annular recess 80 pressure of the'fu'id acting on the opposite surface 71, at this time, being relatively small. As the piston again moves rearwardly, `the passage78 and with it the ceoperating ports Vin the annular chamber 80, areexhausted through a second port 84 opening into the passage 7 8 preferably in advance of the port 77. lVhen the parts are in the position shown in Fig. l., pressure Huid admittedto the mi* end `v of the 'cylinder' space 2 will act against the rear enderf the piston until the exh'ust port 6i opens'. At thisy instant the Vport; is opened, the exhaust valve is thrown rent'- Wardly,fand the secondary ehaustport-.81

is opened permitting laV flow of fluid thron 1 this port, Aannular passageways 82, 83 tot e exhaust passage (i5. .As the pistonv starts' its rearward movement, a pressure'is built u in Y z the rear end of the cylinder'and on the .71 of the exhaust valve, andV at the same time,

the pressi'ire on the face 72 is exhausted so that this valve is thrown'forward and restsv .surer Huid is eut off from 'this end of the cylin- Where'itacts on the surface 720i thefv'al've, the Y tion,` and that I have provided a simple and etcient exhaust valve whereby a very etlicient operationele?. the motor is obtained.V

It desired, the motor may be used for op-4 eiating on solid drill steels and in that form,

means need not be provided tor supplying a. cleansing fluid to the steel bit. Since it is highly desirable to havea cleansing tluid controlling means for use with hollow steels, l

provide means preferably controlled by the handle. let which Controls the flow oi pressure iiuid to the motor, tor adiiiitting a cleansing 'I duid to the axial bore of a" hollow' drill steel forfcleansing pu pose-s. 4For this purpose l have shown the water tub-e l? connected to the boss 1 6 and having communication therewith through a passageway S5A which*conductsthe water or other liquid to an annular. chamber lheld Vagainst rotation.

V86 formed preferably around a gland plug 8T which. is shown as threaded into the head block 13. From this annular passage the water isconducted by a passage 88 to a port 8S vinthe sleeve 90, in which .sleevethevalve ll is adapted to turn, the sleeve being preferably Communicating also with theport 89 is a passageway or groove 9i `termed longitudinally in the sleeve 90 and communicating adjacent its opposite end withV through lthese ports and passages in the reverse order named tothe port 89. Foriiiedalso in the valve i4 and preferably in the same Y water tube. or air adniittesitroni the valve to aV passageway 96, herein shown as 'termed partransverse plane with the passageway S8 is a circumferential groove 94 which is adapted to communicate with the port 89 aiidalso a port 95 tormedin the sleeve in spaced rela tionto the port 89 to conduct water from the allel to the passageway 8,8. rlhe iiow et pressure fluid through thepassage 96 is conducted tl'irough an angularpassage 97 to an aperture 98 iii the gland plug 8T, trom whence it passes through a tube QQ'securely held by the plugy i in the head block 13 through the piston to theV hole 1l in the drillsteel.

rlhe ports and pasin the. ialve lll; and the cooperatii sleeve 90 are so toriiied that when thereu-v V trolling handle lll. is in the position indicated by the lin-e X, all the ports are closed and the y Vinotor'is wholly.inoperative.' As the eon- @trollinghandle lll is moved coaiitercloelrwise (see Fig. 3) air is iirst admitted through Y the tube QQ-to Vthe drill steel to clear the tube, Vd rill steel, and bit oit any particles which l 6,0 might otherwise bloclr'orf hinder a flow of liquid. Upon a further rotation of the controlling handle in a counterelcelrwise direction, the air ow to the tube is cutoff" and i water is admitted to the tube to wash the cutltings out ot' the hole. As the valve is still furrating the drill steel acting par.

still admitted to the drill steel' through the tube 99, and the motor isoperated under full pressure, thecuttings made by the steel'being washedA away by the liquid. To shut ottn the motor, the handle lll is rotated in a clockwise direction (seellig) and the vports andv passages are controlled in a reverse manner, the i'inalow through the hole 1l in the drill steel being aputl' of pressure fluid to vclean the liquid from the steel. It desired, the Vport 93 may be elongated to permit a mixture Vot air and water to flow to the steel, but I preferably use a small port asl tind that the liquid flow is sutlicient to reinovethe cuttings during normal cuttingY operations. g o

In the term or my improved motor shown herein, l preferably provide means for ro- Y and preferably to Connect the chuclrwhich receives the d 1ill steel to the piston 341 so that the latter act'uates the rotating mechanism during the rearward movement et the piston. in order to keep the nietor small,compact, and light andro decrease the weight oi" the piston so ras to increasetlie etliciencyot the motor, the piston is preferably hallowed out throughout thegreater part ot its length to provide a stepped bore in which certain oit the parts oi the rotating mechanism are placed'. In the torni oi" iny improvement shown, straight grooves 100 are' 'termed lon a forwardlyextending sleeve 101 preferably termed integralwith the top plate l2, these groovescoacting with straight loir gitudinally extending feathers 102 formed in a sleeve or retaining bushing 103 attached to the piston as byav three ed connection therewith, although as is obvio .,s, other mean s may be used-for retaining :this bushing in the pisli'rorder that the pressure fluid may eely past tliefeathers 102 to act en the urtaces et the piston head', I alsoA term these featherswith concaved outer surhices y 102 as is clearly shown in VFig. 9. 1, These-coinoveiiient r motor beine'. operate'l.l ',lhe reciprocating movement olf' the piston is 1i ireterably utilized torotatethe mechanism by means l.. spiral rifle grooves 105, tnis Vnut 'be'iig shown asv threaded into the smaller inner bore of the stepped pis-y ton vuntil a tia-ngn lO'formedon'the nut contacts with an annular shoulder adjacent the si'i'ialler Vbore V with these rifle .rifle feathers l0? .i

oves are spirally termed Ving but ,angularly movable'riiebar'lOS, the

lll)

,keep the pistont'rom an angular ative tothe cylinder whenv the` trie piston.v Cooperating.A

armed on a non-reciprocaton the head block 13iinto which the Y lug 87 is screwed, and if desired, there mayV lavaggi@ latter having a guiding and supporting sectibn 109 herein shown as `formedadjacent the feathers y107. Thisf rifle'bar is preferably formed with an Lenlarged hollowhead 110 which surrounds au inwardly projecting. boss gland pins 118 andV paWl springs V114.,` These pawls Y 112 are adapted to engage internal 'ratchet teeth 1,15 formed on a ratchet ring 116, which preferably mounted concentric with the rifle bar and which also carries on its outer circumference a plurality of gear teeth v117. This ratchetring is held in concentric relation to the rifle bar andthe cylinder by la forwardly extending, reduced sleeve 118 which receives the guiding portion 109 of the rifle bar and is Vin turn received by the axial sleeve 101 carried by the top late 12. The rotating parts mounted coaxia ly with the cylinder are thus retained in' their proper relationsiiips to the cylinder and ample'bearing space is provided for the ritie'bar andthe ratchet ring.

The gear teetlr117 coact with and drive a small pinion '119vpreferablyl formed integral witha hollowshaft y"1,201here'in'shown as rotatively mounted on' a bushing 121 which surrounds the side rod 21, the shaft 120 carrying atV its forward end Aclutch teeth 122 adapti ed to ycoact'iwith clutch teeth V123 formedon Vcentric to theV guide rod'21.

a longer shaft 124 which is also mounted' con- The rotative n'iovement imparted to the shaft 124 is referablytransferred to the chuck 7 by a'sinall pinion 125l `--med on' the shaft 1,24 and external 'teeth 126 'termed onthe rear enlarged portion of the chuck. Vhen the piston nieves forward, the straight longitudinal grooves and feathers 100, 102 keep the piston from rotating and the spiral riiie `grooves and feathers 105, 107 rotate the pawl carrier in one direction, the pawls during this rotation sliding over the ratchet teeth 115. However', when the piston moves rearwardly, these rifle grooves and feathers rotate the pawl carrier in the opposite direction, and the paivls engage the ratchet teeth which transfer the rotating movement of the rifie bar to the ratchet ring which in turn rotates the chuck by means ofthe pinions r`and countershaft above described.' The rotating movement of the chuck may be transferred tothe steel and the drill steel may' be 'detachably secured in the chuck in a variety of'ways', but inthe form presented, the steel 9 andthe lugs l10 formed thereon are adapted toy be passed through anr opening 128 inthe chuek`ring 8 into a space between the chuck bushing 6 and the chuck ring, thelatterhaving'formed thereon a plm'- rality of rearwardly'extendinglugs 129 (Fig.

13) by means of which the chuck rin'gis o caused to rotate Withthe chuck 7 i n As is best shown in Fig. 13, the space between the chuck bushing and the chuck ring is-formedwith two oppositely disposed lug 'recivin chambers 130 having a plurality of shoul ers :131

adapted to engage the lugs 10,.When the chuck is rotated, totransfer the rotative' movement ofthe chuck to the steel. If it is desired .to remove the steel from the chuck, the steel is given a partial rotation in advance of .the chuck until the lugs 10 are aligned with the opening formed in the retaining ring 8, when the steel mayA easily be Withdrawn from the chuck. This construction is adapted toreceive a lugged steel of the type shownbut it is to be understood that the openings formed in the chuck and chuck ring mayfibe lvaaried 1 in vaccordance With the style of steel used1 as for instance, these openings may be'form'ed hexagonal to receive a hexagonalvsteel of a typenow commonly used. i

Under certain conditions as when starting a hole on an inclined surface, lit may be desirable tooperate the motor without rotating the steel and for the purpose ofdisconneeting the piston or certain parts connected therewith from the! chuckso that -the steel will not be rotated, I preferably provide a clutch mechanism which maybe of any type desired, vand I have illustrated one form which this clutch and clutch controlling mechanism may assume in Fig.`11.""For Vthis purpose, I have shown a boss' 132 formed on the-side of the cylinder and carrying'a shipper yokek 133 adapted to coact'with-a fgroove formed on .the sleeve or hollow shaft 120 in a .Wellikn'own manner, the shipper actuated-by a' 'shipper rod 134- and a controlling"handle 1v-Effattachcd thereto. The clutch teeth'122 and are' engaged'or disengaged by reciprocating the shipper yoke and the shaft 120. In use the motor may vibrate and tend to throw this shaft forward into engagement lwith the shaft `124 or backward to release this shaft, and to prevent this, I have shown a pin 13G normally pressed into contactWith Ithe con- -trol rod lft'by 'aspring 187, the latter being retained vunder compression by a'cap l138. This pin preferably coact-s with a plurality of grooves 139,140 formed on lthe shipper rod to hold thisrod `against reciprocation until it is actuated bythe operator to throw Vthe clutch.

Practice has'shown that when the motor is.

driving the steel linto hard material, the yteeth 122 and 123fmay become locked together'so thatit Will be difficult to throw these teethf* which these teeth may be more easily disengaged. In .this form of clutch controlling mechanism, IV have shown a shipper yoke 141 and aY shipper rod 142 threaded as shown at 143 into the shipper yoke, the rod 142 being rotated by the operatorby means ot' a handle 144 attached to the outer end oi' the. rod.v

lubricating the ldiilerent parts of the motor,.

but-I preferably provide inthe longitudinal chamber 3 between the shalt 124 and the outer lwall ot' the motor a lubricating reservoir .which is at all times m communication with the various parts ot' the motor which require lubrication. 'A filling port 148 (Fig. 10) is `provided'through which oil or grease may be placed-in vthis oil reservoir and a cap or plug YV149 is also provided .tor closing this port.

'of the motor, and which may be thrown into The sha1-t 124 is shown being provided with a hole 150 through which grease may flow to lubricate the bearing or side rod 21 on which this shaft rotates. A groove is preterably'formed in the engaging parts or' the Shafts 120, 124 to permit a flow of grease to the rotating parts in the rear end oit the cylinder although if desired, this groove may be dispensed with. and suiiicient clearance may be provided around the shafts and the clutch teeth to permit the lubricant to pass. By this improved lubricating means, the

weight of the motor is not increased by pro.

viding additional parts to receive the lubricant supply, and the lubricant reservoir formed about the tie rod 21 is always in free communication with all the moving parts at lboth ends of the motor, and these parts at all times receive an adequate supply ot lubricant. It will thus be seen that I have provided a novel, light, compact, eliicient, andpowertul motor havino an .im n'oved iiston reci irok3 eating means, an improved exhaust valve for controlling the exhaust from the cylinder, and an improved. steel rotatingmechanism, which is always adequately lubricated, which does not take up additional space on the ends or out of operation at the will of the operator. Itfwill further be noted that I have provided an improved lubricating means which does not add to the weight of the motor, which will contain a'sutiicient supply of lubricant for a long period of operation, and which will efficiently lubricate all of the working parts. It will be noted that another feature of the invention is the control of the flow of pressure fluid to the motor and the flow of cleansing fluid to the dri-'ll bit to admit the flow of these liuids to the proper parts in their properfsequence, and that this flow is so controlled that the air is admitted to the steel before and vafter the flow of cleansing liquid toproperly clear the steel and tube ot' obstructions. f -V Y While I have in this application specifically Vdescribed two embodiments `which my in-v vention may 'assume in'practice, it is to be understood. that thesefforms are shown for illustrative purposes onlyV and that the invention maybe modiliedand embodied in various other forms without'departing from its spirit or vthe scope of the appended claims.

lllhat I claimas new and desire to secure byfIiettors Patent is:l

1. In Aa drilling mechanism-,- a drillingmotor comprising a cylinder and a- Vhollow piston rcciprocable therein, a tool actuated by said piston, and rotation mechanism for said tool comprising relatively movable conccntrically arranged members extending into the interior of and connected to said piston,

one of said members controlling said piston l for predetermined movmnentv during reciprocation thereof, andl operative driving connections between the other ot said members and said tool.

2. Inl a drilling mechanism, a drilling motor comprising` a cylinder and a hollow piston movable therein, a toolactuated by said piston, a toolrec'eiving chuck, andro- .tationA mechanism for said'chuck operated by said piston. including a member cooperating with 'the interior of said piston 'or preventing rotation thereof, a member hav# ing spiral lugs and arranged concentrically with said member and extending intof the interior or' therear end of the piston, said members being reiatively movable, means carried l by the piston having spiral grooves for cooperating with the spiral lugs on said latter member, operative4 driving connections between said last mentioned member and said tool receiving chuck, and means forinterruptiug rotation of said chuck while relative movement between said members continues.

3. In a. drilling mechanism, a drilling moto-r comprising a cylinder and a hollow piston reciprocable therein, a tool actuated 'by said pistoma tool receiving` chuckfand rotation means for said chuck including a member extending forwardly from the rear end or' said cylinder and having straight grooves cooperating withsaid piston for prelll) venting relative rotation between the latter Y and said cylinder, a member arranged concentrically with said member and extending forwardly from the rear end of the cylinder and having spiral grooves cooperating with said piston and yadapted to be rotated by the latter, and driving connections between said rotatable member and said tool receiving chuck. i l

In testimony whereof I aliiX my signature. i

l s enonenn. GILMAN. 

